Knossos tablet KN 281 R w 21 & the supersyllabogram RI = linen undergarment:

Knossos tablet 281 R w 21 linen undergarment or tunic

This is perhaps one of the easiest supersyllabograms I have ever had to translate. It is pretty much self-evident. The supersyllabogram RI stands for “rino” which is the Linear B word for “linen”, referring to the linen undergarment or linen tunic or linen chiton. Mycenaean armour consisted of an outer plated armour called “toraka” in Linear B or “thorax”, which means “breastplate armour” in English. Under the breastplate the Mycenaean warriors wore an undertunic, a.k.a. chiton, which was made of linen.

The only question is, why is the supersyllabogram attributive, appearing as it does inside the ideogram for “tunic”? Attributive supersyllabograms always describe an attribute of the ideogram within which they fall. The ideogram is of course that for “tunic”. But it is more than just a tunic. It is a linen tunic. Hence, “rino” or linen is attributive. The Linear B and ancient Greek for “thorax” appear just below the Linear B, Linear B Latinized, ancient Greek and English for “linen”.